Investigate possible bugs in top-level-await tests

[cspotcode]

@ejose19 Can I get a review of our top-level-await tests from you, since you wrote the initial implementation?

In the original PR for top-level await:
https://github.com/TypeStrong/ts-node/pull/1383/files

I see a couple things I'm unclear on:

When running upstream tests, we do not await, so I think failures will be ignored:
https://github.com/TypeStrong/ts-node/pull/1383/files#diff-1d9efcccb250238d73480e5c49afae61494dd3103e9a16c38d36979f27c6ff90R2165

When calling runAndWait we also do not await. Why is that?
In nodejs's tests, there is await

[cspotcode]

I think I fixed these issues in #1677

[cspotcode]

When running upstream tests, we do not await, so I think failures will be ignored

Looking at this again, it appears the missing await was on some prototype code that perhaps should be deleted?